A Study of TQB2450 Injection Plus Chemotherapy Followed by TQB2450 Plus Anlotinib Versus Tislelizumab Plus Chemotherapy Followed by Tislelizumab in the Treatment of First-line Non-squamous Non-small Cell Lung Cancer(NSCLC).

PD-L1(programmed cell death-Ligand 1) may be expressed on tumor cells and/or tumor-infiltrating immune cells, which can inhibit the anti-tumor immune response in the tumor microenvironment. On T cells and antigen-presenting cells, PD-L1 binding to PD-1 (programmed cell death-1) and B7.1 receptors inhibits cytotoxic T cell activation, T cell proliferation, and cytokine production.